Not sure if anyone else pointed this out, but your questions assume you're addressing someone who'd not a Young Earther. They would first reply that the according to the Bible the Earth is only 10 Thousand years old not 10 Billion....

Of the hundreds of religions and gods that people all over the planet believe in, why did you reject all others in favor of Christianity? Once you have that answer, you'll understand why I reject one more.

Why didn`t Jesus write anything down? The new testament is full of so many contradictions, and there are so many writings that were excluded (by whom, I wonder) that one is left to conclude that Jesus never wanted to start an actual church. Either that, or he was really inept.

I prefer your first statement. If I simply believe, I'm in. That makes the whole moral authority wielded by the Church a moot point. I'm running out of time, I have sins to commit, but I'm sorry for it, and I believe.

I see your Pascal's wager and I'll raise you a Murder, two Adultries, and a Covet of one kind or the other.